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Posted by anoop on January 13, 2008, 1:19 pm
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> We have recently installed a new VoIP phone system, I got two Vlans
> configured on all the HP switches (they are the only ones that are
> POE) with them configed as vlan1 (data) being untagged and 200 (voice)
> as tagged. I also have the last two ports on the switch etherchanneled
> to a cisco switch. I have two DHCP servesr, one for the voice Vlan and
> one for the data.
>
> So I have two issues, it was brought to my attention by our helpdesk
> guy that once in a while when he images a machine and it comes up,
> that it gets an IP address from the Voice vlan, but he can do a /
> release and /renew and all is fine, gets a new IP from the data dhcp
> and we don't see it again. The only catch to this is, that if the
> machine is off line for a couple weeks and comes back, it may get a
> DHCP address from the voice vlan. The only thing that I can think of
> is if during that time the person is gone the address lease expires on
> the Data DHCP server and somehow it is lost.
This is a strange problem. Unless you're using some dynamic
method of assigning stations to VLANs, this should not be
happening.
> My other issue is this. While trying to solve the previous issue I
> decided to force the DHCP server on a tagged only port (force it to be
> on Vlan 200 only). When i do that nothing can talk to it and vice
> versa. I even tried putting another machine on the same switch forcing
> it too to be on Vlan 200 and they are unable to see each other.
Is the DHCP server configured to send tagged traffic? [I assume
the configuration above is about the switch port being configured
to treat VLAN 200 as tagged and to drop untagged traffic received
from the port.]
Anoop
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